Scaling device



y 3, 1932- J. c VAN ALPHEN ET AL 1,856,299

SCALING DEVICE Filed Feb. 5, 1931 N V5 IV TOPS Johan/res Come/l3 MM/Mel;P/fer fer Hank and Theodor Lec/ze/f.

Patented May 3, 1932 UNITED STATES PATENT OFFICE JOHANNES CORNELIS VANALPHEN, PIETER TIER HAAK, AND THEODOR LECHELT, OF AMSTERDAM, NETHERLANDSSCALING DEVICE Application filed February 5, 1931, Serial No. 513,556,and in the Netherlands October 16, 1930.

The invention relates to automatic scaling devices for the scaling ofiron, which .is covered with rust, thick coats of paint and the like,for the working of concrete or for chipping oil the scale ofboilerplates and so on.

Scaling devices are known in which two or more tools are mounted on ashatt. By rotating this shait at a high speed an automatic scalingdevice is obtained. The lixing or mounting oi. the tools on the shaft,however laced with serious obstacles. The lirni securing of the toolswhich are liable to loosen during the use of the scallng device. not onlleads to com )licated iixinc' l n U a way that they are immovablymounted on the holder causes, apart from the loosening of the tools byvibration, vibration of the automatic scaling device with respect to thematerial to be worked. This repulsive action makes the handling of thescaling device very heavy and tiresome. With the automatic scalingdevice according to the invention these ditliculties are surmounted.

The automatic scaling device according to the invention comprisestoolholder provided with axially directed chambers, in which the ends ofthe tool, similar in form to the chambers, are axially arrangedalternately with intermediate discs. Said ends, movable in acircumferential direction, are secured by means of a screwed plug placedon the toolholder. Thus each tool is separately supported in thetoolholder. The invention further comprises the provision in the body ofthe toolholder of two or more axially directed channels of cylindricalform which are situated equidistantly from the axis of the tool-holderand which are in communication with the outside circumference of thetooiimioer by means of narrow slots, which are smaller than the diameterof the ends of the tools.

One end of the body of the toolholder is provided with a supporting-headwhich is formed as a whole with it, whereas the other end is providedwith a screw-thread on which a plug is screwed. A. drivingspindle forthe toolholder is connected to this plug.

An embodiment of the automatic scaling device according to the inventionis illustrat-ed in the accompanying drawings:

Fig. 1 shows the automatic scaling device, partly in elevation, partlyin section.

Fig. .3 is a view of the scaling device in another position.

Fig. 3 is an elevation of the device seen from the driving side of theholder.

Fig. 4; is a cross-section of the toolholder over one set of tools.

The body 1 of the toolholder, in the form indicated in Fig. a, isprovided with a supporting-head 2. The axially directed, concentricallysituated chambers 3 are similar in term to the ends 4 of the tools 5.The chambers 8, in the form of cylindrical channels situatedequidistantly from the axis of the toolholdcr, are in communication withthe outside circumference of the toolholder by means 01 narrow slots,which aresmaller than the diameter oi? the ends of the tools. The d ofthe body of the toolholder opposite to the supporting head is providedwith a screw thread, on which a plug 6 can be screwed. The drivingspindle of the automatic scaling device is connected to this plug 6. Thetools 5, consisting of toothed chisels, are inserted :lrom the plug sideof the toolholder into the channels 2-). The ends of the handles ofthese tools are similar in form to the cylindrical channels orchan'ibers 3. Intermediate discs are placed alternately with the toolsinto the toolholder. In this manner the tools are situated in the holderwith the desired dis tance between them. These pieces are secured in theholder by means of the screwed plug 6 in such a way that the tools 5 aremovable in the holder.

The narrow slots, with which the cylindrival channels are incommunication with the outside circumference of the toolholder, are

each wider than the part of the tool which lies in the slot.

Consequently the tool can place itself under a fixed angle with regardto that diameter of the holder which is directed through the centre ofthe handle end. This angle, which is indicated in Fig. 4, actuallydetermines the cutting-angle of the tool. In action, the tool will placeitself against the shoulder of the slot of the cylindrical channel 3. Inthe illustrated example three channels 3 are made in the toolholder 1.In accordance with the character of the material to be worked and thevelocity of rotation of the automatic scaling device more channels orchambers 3 provided with the respective tools can be used. The toolsthemselves are also selected in accordance with the material to beworked. The intermediate discs 7 are very carefully chosen in number andthickness in order-to fix accurately the mutual distance of the tools inaccordance with the material to be worked.

In consequence of the simple construction of this automatic scalingdevice an easy exchange of the tools is made possible. Moreover it isimpossible for the tools to loosen by vibration, as they are secured ina radial sense, being movable in the direction of the circumference ofthe automatic scaling device and also, if desired, axially withorwithout the aid of springs. By this arrangement an easy pressing ofthe device against the material to be worked is obtained, so that thehandling of the apparatus takes place without trouble. 7

As the working area of the automatic scaling device can be broughteasily in accordance with the totalsurface to be worked, this scalonwhich av plug is screwed, a driving spindle for the toolholder beingconnected to this plug.

In testimony whereofiwe afiix our signatures.

JOHANNES CORNELIS van ALPHEN. PIETER ler HAAK. THEODOR LECHELT.

ing device is specially suitable for working the hulls of ships, whichare covered with rust or thick coats of paint. also for removing theskin dueto rolling of new ironwork.

The advantage of this automatic scaling device is also prominent infinishing and working concrete.

In the event of a fracture only one or more of the tools break,specially by the parts which lie in front of the slots; the body of thetoolholder, however, 'remains'in working order, as the pressureexercised on the tools is uniformly divided over the entire body of thetoolholder. A large security of service is thus 7 obtained.

cured in the toolholder.

2. A scaling device as claimed in .claim 1, wherein the body of thetoolholder is provided with two or more axially directed chan-

